@Come-from-Beyond:Do I need to delete the .nxt files everytime I want to run the client? (or is it necessary at all, even the first time, what truble happens if I don't remove them at all even in the first run?)How to know what is the recommended fee to send a tx? It is already 12am GMT, is it released already by BCNext?

No need to delete *.nxt files. Only if Nxt doesn't run.There is no recommended fee. A block can contain only 255 transactions max. If more than 255 available then transactions will be added according to higher fee.It's released. We are waiting for the 1st generated block.